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Tech Five: Shares of Yelp, Twitter sinking

Employees of the online review site Yelp watch as New York City Mayor Michael Bloomberg speaks at the new East Coast headquarters of the tech company in New York City.(Photo: Spencer Platt, Getty Images)

It's a rough morning for the online recommendations service Yelp. Let's take a look at the technology stocks to watch Thursday:

Yelp. Shares sunk nearly 5% in pre-market trading after reporting net revenue of $88.8 million, above analyst forecasts. Second quarter revenue was up 61% compared to last year. Meanwhile, earnings per share jumped to 4 cents, a bump from last year's net loss of 1 cent per share. But as CNBC notes, growth in business accounts did not meet Wall Street expectations.

Twitter. If Wednesday was a party for Twitter stock, today is the hangover. In pre-market trading, shares of Twitter fell 2.5% after closing Wednesday with a nearly 20% surge in price. The Wednesday spike stems from Twitter's second quarter earnings results, which showed a big spike in monthly active users.

LinkedIn. The social network aimed at professionals will report second quarter earnings after the markets close Thursday. According to analyst estimates compiled by Bloomberg, the company is expected to report an earnings per share of 39 cents off $511 million in revenue.

Samsung. On the Korean markets, shares of the electronics giant plunged 3.7% off disappointing quarterly earnings. For the second quarter, profit dipped lower than expected as sales of its smartphones continue to slow down, reports AP.